Bay Area Older Homes: Earthquakes and Wiring

By Ishaq Hassan. Updated October 10, 2026. 3 min read.

Short answer: Many Bay Area homes, from San Francisco Victorians to older San Jose bungalows, were built long before modern earthquake, electrical and energy codes. Have older homes checked for seismic weak spots such as unbolted foundations and soft stories, update old wiring and panels before adding EV chargers or heat pumps, and get permits for structural and electrical work.

Bay Area older homes have beautiful details, but they also face earthquakes, aging wiring and the demands of all electric living. The 1989 Loma Prieta earthquake showed how vulnerable older buildings can be. This guide covers the main issues and updates.

Earthquake weak spots in older homes

Unbolted foundations: older wood homes may not be bolted to their foundations.
Cripple walls: short walls in crawl spaces that can collapse without bracing.
Soft stories: ground floors with garages or large openings that can fail. San Francisco’s mandatory soft story program required many older wood buildings to be retrofitted.
Brick chimneys: unreinforced chimneys can crack and fall.

Illustration of a concrete block wall with a long crack and water seeping through — Wide or growing cracks, or cracks that let water in, need a closer look.

Older wiring and all electric upgrades

Knob and tube wiring in older Victorians and Edwardians
Small panels that cannot support EV chargers, heat pumps or induction cooking
PG&E power shutoffs during high fire risk, which make backup power popular
San Jose has some of the highest electric vehicle ownership in the country

Read signs of dangerous wiring and whole house surge protection.

Need help with foundation repair?Free to call. You will be connected with an available local provider where one serves your area.

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Illustration of a wall mounted EV charger in a garage charging a red car — A home EV charger usually needs its own circuit and a permit.

Fog, moisture and roofs

Coastal fog and winter storms keep roofs, siding and wood damp in parts of San Francisco. Older roofs and flat roofs on row houses need regular checks, and moisture can lead to rot and mold in crawl spaces.

Permits and licensing

Structural, electrical and plumbing work needs permits, from the Department of Building Inspection in San Francisco and the Building Division in San Jose. California contractors are licensed by the Contractors State License Board.

Illustration of an attic with a water stain on the roof boards and a bucket catching drips — Stains and damp insulation in the attic are often the first sign of a roof leak.

Local help in the Bay Area

Illustration of a brick house with a stair step crack running down from a window — Stair step cracks in brick can be a sign of foundation movement.

Quick answers: bay Area older homes

Is my older Bay Area home safe in an earthquake?

Older homes may need foundation bolting, cripple wall bracing or soft story work. A structural engineer or experienced contractor can check.

What is a soft story building?

A building with a weak ground floor, often with garages or large openings, that can fail in an earthquake.

Can my old panel handle an EV charger?

Often not without an upgrade. An electrician can do a load calculation.

Do contractors need a license in California?

Yes. The Contractors State License Board licenses contractors.

Who works on older Bay Area homes?

Sifixit can connect you with local roofing, electrical and cleanup providers.

This guide covered bay Area older homes. For more background, see the FTC’s advice on hiring a contractor and avoiding home improvement scams, and if you need help, Sifixit can connect you with a local provider.

This guide is general information for homeowners, not professional, insurance or safety advice for your situation.

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